EP2882975A1 - Piston-cylinder arrangement, in particular for a clutch actuating system in a motor vehicle - Google Patents
Piston-cylinder arrangement, in particular for a clutch actuating system in a motor vehicleInfo
- Publication number
- EP2882975A1 EP2882975A1 EP13753564.7A EP13753564A EP2882975A1 EP 2882975 A1 EP2882975 A1 EP 2882975A1 EP 13753564 A EP13753564 A EP 13753564A EP 2882975 A1 EP2882975 A1 EP 2882975A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- sleeve
- cylinder
- cylindrical portion
- cylinder arrangement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
- F16D2025/081—Hydraulic devices that initiate movement of pistons in slave cylinders for actuating clutches, i.e. master cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2300/00—Special features for couplings or clutches
- F16D2300/18—Sensors; Details or arrangements thereof
Definitions
- Piston-cylinder arrangement in particular for a clutch actuation system in a motor vehicle
- the invention relates to a piston-cylinder arrangement, in particular for a clutch actuation system in a motor vehicle, having a piston which is arranged axially movable inside a cylinder, and an inductive sensor system, comprising a fixed on the piston conductive target and a sensor, which attached to the cylinder.
- Displacement sensors which are arranged in master cylinders of the clutch actuation system of the motor vehicle, meet these requirements.
- various technologies are used by sensors such as linear sensors or Hall effect sensors, which require the use of a magnet to detect the position of the piston.
- cylindrical or cylinder-segment-like magnets are used.
- the cylindrical magnet 24 is clamped to the piston 23, for example.
- FIG. 4 a shows a master cylinder 20 to which the sensor 21 is attached externally to the cylinder housing.
- FIG. 4b From the longitudinal section of Figure 4b it can be seen that in the interior of the cylinder housing 22, a piston 23 mounted axially movable.
- the piston 23 carries on its front side a likewise cylindrical magnet 24, which encloses a mounting bracket 25 which dips through the magnet 24 into the piston 23 and thereby fixes the magnet 24 on the piston 23.
- An exploded view in Figure 4c shows once again the items for attaching the magnet 24, consisting of the mounting bracket 25 and the piston 23.
- the mounting bracket 25 is an additional element, which is necessary for the fixation of the magnet 24 on the piston 23.
- FIG. 5 shows another fastening technology on a master cylinder 26.
- the sensor 27 is fastened to the housing 28 of the master cylinder 26.
- a cylinder-segment-like magnet 29 is inserted on the end face of the piston 30 into the interior of the piston 30, resulting in a very cost-intensive production of the master cylinder 26 by itself ( Figure 5b).
- the cylinder segment-like magnet 29 is glued in the piston 30, wherein the gluing represents a time-consuming step during the assembly process.
- Other displacement sensors work, for example, according to an inductive mode of action, wherein the coil-containing sensor and / or a drive and / or evaluation circuit outside of the cylinder, preferably on a circuit board, are arranged.
- a piston moves, on which an electrically conductive target is fixed, which is passed during the movement of the piston on the coil system, while immersed in the magnetic field of the coil system and this changed.
- the altered magnetic field is a measure of which way the piston has swept, which is representative of the driver's request.
- the conductive target must be attached to the piston with high precision, so that the inductive sensor is allowed to determine the position of the piston with good repeatability.
- the invention is therefore based on the object to provide a piston-cylinder arrangement in which the target is inexpensively attached to the piston and still a high accuracy in determining the position of the piston is ensured by the inductive sensor.
- the object is achieved in that the conductive target is formed as a sleeve, which is pushed over an approximately complementary cylindrical portion of the piston.
- the sleeve can be easily attached to the piston without additional aids or gluing by the diameter of the sleeve is chosen approximately the same size as the outer diameter of the complementary cylindrical portion. The sleeve thus clamped to the piston, whereby a cost-effective production method of the piston-cylinder assembly is found.
- the sleeve has a longitudinal slot for temporary expansion in the attachment to the complementary cylindrical portion of the piston.
- This has the advantage that the diameter of the sleeve and the complementary cylindrical portion of the piston can be chosen approximately equal. Since the longitudinal slot widens during assembly of the sleeve on the piston and thus the diameter of the sleeve is slightly increased, the sleeve can be easily mounted on the piston. After completion of the assembly, the sleeve is firmly against the surface of the cylindrical portion of the piston.
- the cylindrical portion is bounded by at least one radial projection, to which the sleeve is pushed onto the piston. The radial projection contributes to the correct positioning of the sleeve on the piston.
- the inductive sensor can produce a reproducible signal, as a displacement of the sleeve during the use of the piston-cylinder assembly in Motor vehicle is not possible.
- the cylinder-like portion on a side facing the sleeve has a bevelled edge for guiding the sleeve during assembly.
- the bevelled edge which is also referred to as bevel, serves to gradually expand the sleeve when applied to the cylinder-like portion, so that it can be mounted better.
- the chamfered edge ends at a step which fixes the mounted sleeve.
- the sleeve is bounded on one side by the radial projection and on the other side by the step, so that the sleeve in use of the piston-cylinder assembly can not change in position.
- the radial projection of the cylindrical portion is formed circumferentially. This ensures a particularly secure positioning of the sleeve on the piston.
- the sleeve consists of a light metal, preferably aluminum.
- a light metal simplifies the manufacturing process of the sleeve, which is comparable to the production of a spacer sleeve. From aluminum, a plate is stamped or pressed, which is then rolled. The contactless opposite ends of the plate thereby form the longitudinal slot. Due to the longitudinal slot, the sleeve can change its diameter at any time.
- Figure 1 Schematic representation of an electro-hydraulic clutch actuation system in a motor vehicle
- FIG. 2 shows an exemplary embodiment of a master cylinder according to the invention according to FIG. 1
- FIG. 3 illustration of the assembly process of the master cylinder according to FIG. 2
- Figure 4 a first embodiment of a master cylinder according to the prior art
- Figure 5 a second embodiment of a master cylinder according to the prior
- an electro-hydraulic clutch actuating system 1 is shown, as it is used today in motor vehicles.
- a clutch actuation system 1 comprises an electro-hydraulic actuation system in the form of a master cylinder 2, 3, which has a cylinder 2 designed as a housing, in which a piston 3 is movably mounted.
- the piston 3 is driven by an electrically commutated electric motor 4, which is controlled by a control unit 5 via an output stage 6.
- the output stage 6 is fastened to the cylinder 2 together with the electric motor 4.
- the radial movement of the electric motor 4 is converted via a gear 7 in the axial movement of the piston 3.
- electrohydraulic clutch systems are known, but the piston can also be connected directly, waiving the electric motor 4, with the accelerator pedal of the driver of the motor vehicle.
- the master cylinder 2, 3 is connected to a slave cylinder 9, which actuates a clutch 10.
- the adjustment of the position of the clutch 10 is due to the drive of the piston 3 by the electric motor 4.
- the master cylinder 2, 3 and the clutch 10 to the slave cylinder 9 are arranged spatially separated in the motor vehicle.
- a sensor 1 1 is attached, where wherein the coil assembly contained in the sensor 1 1 and not shown opposite an electrically conductive target 12, which is mounted outside of the movably mounted piston 3 inside the cylinder 2.
- the master cylinder 13 is shown in more detail.
- the inductive sensor 11 is fixedly arranged on the cylinder 2 of the master cylinder 13 serving as the outer housing.
- the longitudinal section in Figure 2b shows that within the cylinder 2 of the master cylinder 13 of the piston 3 is mounted.
- the piston 3 has a cylindrical portion 14, which is bounded by a radially circumferential projection 17 ( Figure 2c).
- the cylindrical portion 140 is formed on a support member which is connected by means of pressing with a piston / base body.
- Deviating, of course, other compounds such as form-fitting or gluing or a one-piece piston conceivable.
- a sleeve 15 is pushed, which consists of aluminum and which has a longitudinal slot 16.
- the sleeve 15 is a special embodiment of the conductive target 12, which together with the sensor 1 1 determines the position of the piston 3.
- Figure 3a shows that the sleeve 15 is moved during mounting on the cylindrical portion 14 of the piston 3 in the direction of the arrow A and thereby widened. This is done by the sleeve 15 at one, the sleeve 15 facing the end of the section 14 via a chamfer 18, which is formed on the cylindrical portion 14 of the piston 3 and a beveled circumferential edge, is guided and expanded, which is indicated by the arrow B is illustrated in Figure 3b. By pushing the sleeve 15 over this chamfer 18, the diameter of the sleeve 15 is widened, which is easily possible due to the longitudinal slot 16.
- the chamfer 18 has at its end a step 19, behind which the diameter of the cylindrical portion 14 of the piston 3 is slightly reduced (Figure 3c). If the sleeve 15 has reached the step 19, then the sleeve 15 has expanded and assumed a larger diameter than at rest. Subsequently, the entire sleeve 15 is pushed over the step 19 (FIG. 3d) until the sleeve 15 has reached the radially circumferential projection 17. The radially circumferential projection 17 limits the position of the sleeve 15 in the direction of arrow A ( Figure 3e). The width of the sleeve 15 is dimensioned so that it ends just behind the projection 19 ( Figure 3f).
- the sleeve 15 verclipst behind the step 19 and thereby reduces its diameter slightly again. In this way, the sleeve 15 is firmly against the cylindrical portion 14 of the piston 3 and is held on one side by the step 19 and on the other side by the radially circumferential projection 17 so that their position no longer change can.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012214129 | 2012-08-09 | ||
PCT/DE2013/200088 WO2014023305A1 (en) | 2012-08-09 | 2013-08-01 | Piston-cylinder arrangement, in particular for a clutch actuating system in a motor vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2882975A1 true EP2882975A1 (en) | 2015-06-17 |
EP2882975B1 EP2882975B1 (en) | 2016-07-13 |
Family
ID=49080635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13753564.7A Not-in-force EP2882975B1 (en) | 2012-08-09 | 2013-08-01 | Piston-cylinder arrangement, in particular for a clutch actuating system in a motor vehicle |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2882975B1 (en) |
CN (1) | CN104662319B (en) |
BR (1) | BR112014031538B1 (en) |
DE (2) | DE102013215078A1 (en) |
WO (1) | WO2014023305A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112015001418A5 (en) * | 2014-03-24 | 2016-12-29 | Schaeffler Technologies AG & Co. KG | Master cylinder for a hydraulic system |
DE102014211427A1 (en) | 2014-06-16 | 2015-12-17 | Schaeffler Technologies AG & Co. KG | Sensor holder for a hydraulic cylinder and method for fixing a sensor |
DE102014211430A1 (en) * | 2014-06-16 | 2015-12-17 | Schaeffler Technologies AG & Co. KG | Master cylinder for a clutch release system |
DE102014211887A1 (en) | 2014-06-20 | 2015-12-24 | Schaeffler Technologies AG & Co. KG | Piston-cylinder arrangement, in particular for a clutch actuator |
DE102016006053A1 (en) | 2016-05-18 | 2017-11-23 | Fte Automotive Gmbh | Hydraulic cylinder, in particular master cylinder for a hydraulic clutch or brake actuation for motor vehicles |
CN106704410B (en) * | 2016-11-30 | 2019-03-01 | 浙江吉利控股集团有限公司 | A kind of clutch general pump |
EP3971424A1 (en) * | 2020-09-18 | 2022-03-23 | ZF CV Systems Europe BV | Pneumatic actuator with magnetic position sensor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19816513A1 (en) * | 1998-04-14 | 1999-10-21 | Mannesmann Sachs Ag | Actuator for a fluid operated clutch |
DE10323797B4 (en) * | 2003-05-23 | 2005-05-25 | Zf Sachs Ag | Piston-cylinder unit with a sensor system |
EP1602544B1 (en) * | 2004-06-04 | 2011-01-05 | ZF Friedrichshafen AG | Hydraulic master cylinder |
-
2013
- 2013-08-01 BR BR112014031538-8A patent/BR112014031538B1/en not_active IP Right Cessation
- 2013-08-01 DE DE102013215078.4A patent/DE102013215078A1/en not_active Withdrawn
- 2013-08-01 CN CN201380042081.5A patent/CN104662319B/en not_active Expired - Fee Related
- 2013-08-01 EP EP13753564.7A patent/EP2882975B1/en not_active Not-in-force
- 2013-08-01 DE DE112013003940.0T patent/DE112013003940A5/en not_active Withdrawn
- 2013-08-01 WO PCT/DE2013/200088 patent/WO2014023305A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2014023305A1 * |
Also Published As
Publication number | Publication date |
---|---|
BR112014031538B1 (en) | 2021-07-13 |
WO2014023305A1 (en) | 2014-02-13 |
EP2882975B1 (en) | 2016-07-13 |
CN104662319B (en) | 2017-02-22 |
DE102013215078A1 (en) | 2014-02-13 |
BR112014031538A2 (en) | 2017-08-22 |
CN104662319A (en) | 2015-05-27 |
DE112013003940A5 (en) | 2015-05-28 |
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